[The posthumous birth of Évariste Galois (1811-1832)].

The publication of Galois' works in the Journal de Liouville (1846) was announced during a debate between academicians Libri and Liouville as early as 1843. Rather than limiting this publication to a study of controversy, we would like to show that it is inscribed in a larger context of the redefinition of algebra, which this debate illuminates. In order to understand the rediscovery of Galois, it must be inscribed in the median time of mathematical practices and usages.